Implement root mean square amplitude

[clarkenj]

A measure of average loudness, considered more accurate than relying on the peaks. Parselmouth function.

References (AD/MCI):

• López-de-Ipiña et al. (2013)
• Hasan & Krishnan. (2022)

[clarkenj]

Although this is meant to be a measure that enables comparisons of different sounds, the differences in recording quality might be a problem